Keep with Low Lights around the roots, part and underneath, to create shadowing at the top of the head. Then use small, single highlights around the face, through to the ends of the Hair to elongate the face.
The film's relevance to the wider ethics of war is questionable. While it portrays a grotesque injustice based on fact, you might be left with the feeling that it was little more than a horribly freakish incident.
Stanley Kubrick's Paths of Glory scene demonstrating a one-point perspective. This is a good example of unifying principles of Gestalt design theory applications of grouping, containment, proximity, continuity, repetition and closure.